Looks like a longer tube. How did they get the efficiency up?
Downclock and downvolt each chip.
Nope. Its a new parallel powering layout which is simply more efficient. If I get a Prisma you'll be able to see it in the pictures.
That may be true but it's also underclocked. The tubes were 8.3gh/s per chip and Prisma is 7.3gh/s.
Where did you hear about this "parallel powering layout"?
Downclocking the chips by 10% doesn't result in 25% power savings. The design was first done by XBTec on their Pacifics (
https://farm4.staticflickr.com/3874/14825302026_f8e55aca1f_o.jpg) which results in significantly lower power requirements by stringing the chips together. [Note their V1 didn't actually realise the power savings in the design due to other bottlenecks, but the V2 did]. This is the same 'technology' that friedcat has put on the Prisma to generate the power savings compared to the Tube.
is that the stringing to run them off 12V without massive losses on the DC/DC converters?
